L2TP Session Does Not Disconnect Automatically (232153)


The information in this article applies to:

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Datacenter Server
This article was previously published under Q232153

SYMPTOMS

If Windows 2000 is configured to use Layer 2 Tunneling Protocol (L2TP) with automatic disconnection enabled, Windows may not drop the L2TP session even when no data is being transferred.

CAUSE

A "keep-alive" mechanism is used by L2TP to differentiate tunnel outages from extended periods of no control or data activity. This is accomplished by injecting "Hello" control messages into the control stream every 60 seconds.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

REFERENCES

For additional information, please see the following article in the Microsoft Knowledge Base:

181431 How Windows NT RAS Handles Auto Disconnect

Modification Type:MajorLast Reviewed:11/21/2003
Keywords:kbnetwork kbprb KB232153
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